Officer Cesar Quitana patrols a dangerous barrio in Juarez, Mexico. He is armed with an M16 assault rifle -- a weapon that would be no match in a gunfight with drug lords.

"I think most of us feel scared just to bring this with us ," he says, pointing to the rifle in the front seat of his patrol car. "But this is what we use to defend ourselves."

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The semiautomatic pistols fire a 5.7-by-28 millimeter round, which is technically a rifle round, according to the ATF. Newell says the round has a special nickname in Mexico. "It's called 'mata policias,' or 'cop killer,' " he says.

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Probably sprayed with Teflon and able to explode babies from a mile away.

The semiautomatic pistols fire a 5.7-by-28 millimeter round, which is technically a rifle round, according to the ATF. Newell says the round has a special nickname in Mexico. "It's called 'mata policias,' or 'cop killer,' " he says.